Question

Using the table below, please calculate the proportion of the risk of having a car accident attributable to texting while driving among those who text and drive. Select the correct attributable risk percent from the options below.

	Car accidents
Texting while driving	Yes	No	Total
Yes	18	26	44
No	11	85	96
Total	29	111	140

A. 3.57

B. 10%

C. 30%

D. 72%

E. None of the above

Answer 1

The answer will be 72% (Option D).

Explanation: Attributable risk percent is difference in the accident rates in exposed (Texting while driving) & unexposed (Doesn't texting while driving) individuals.

So, accident rates of texting while driving = 18/44

So, accident rates of doesn't texting while driving = 11/96

So, attributable risk = Accident rates of texting while driving - Accident rates of doesn't texting while driving = 18/44 - 11/96 = 0.2945 (Up to 4 decimals)

So, attributable risk percent = (Attributable risk / Accident rates of texting while driving) x 100% = [0.2945/ (18/44)] x 100% = 71.99% 72%